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Comparison of observed Ca xix and Ca xviii relative line intensities with current theory

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Abstract

A comparison is made between Ca xix and Ca xviii line ratios observed in solar flares with the Bent Crystal Spectrometer (BCS) on the Solar Maximum Mission (SMM) satellite and currently available atomic data. Close agreement is found with the excitation rates recently published by Pradhan et al. (1981). The observations show little dependence of line ratios on electron temperature, supporting a further conclusion that cascade contributions to the 23 P and 23 S levels are not significant.

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Authors and Affiliations

  1. Department of Theoretical Physics, Oxford University, 1, Keble Road, OX1 3NP, Oxford, U.K.

    C. Jordan & N. J. Veck

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  1. C. Jordan
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  2. N. J. Veck
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Jordan, C., Veck, N.J. Comparison of observed Ca xix and Ca xviii relative line intensities with current theory. Sol Phys 78, 125–135 (1982). https://doi.org/10.1007/BF00151148

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